How do I make spiraling loop cuts around a cylinder?
I'm sure there are more ways of doing this,but I can think of 2 ways:

First one, with tools you already have:
screw modifier and array modifier:



Second one with addons Add Curve: Extra Objects and F2 addon.
Extra objects addon allows you to to create spiral curves, and F2 addon enables you to fill in the spaces quickly


Create the spiral curve with the extra objects addon, and pres Alt+C to convert it to mesh, then, with the F2 addon fill in the cylinder



and in both cases you find the end of the spiral, place a cursor on it, select the rest of the loop and pres S + Z + 0



and finally, remove the double verticesyou have from the scaling